Improvement in plows



J. ORMISTON.

Plow.

Patented June 2, 1857.

AM. PHOTD-LXTHQ. CU. NY. (DSBURHE'S PROCESS.)

UNITED STATES PATENT OFFICE.

JOHN ORMISTON, OF CENTRE TOWNSHIP, MORGAN COUNTY, OHIO,

ASSIGNOR TO D. N. ALLARD.

IMPROVEMENT IN PLOWS.

Specification forming part of Letters Patent No. 17,476, dated June 2, 1857.

To all whom it may concern:

Be it known that I, JoHN ()RMISTON, of Centre township, in the county of Morgan and State of Ohio, have invented certain new and useful Improvements in Self-Sharpening Flows; and I do hereby declare that the following is a full, clear, and exact description of its construction and operation, reference being had to the accompanying drawings, making a part ofthis specification, in which- Figure 1 represents a perspective view of said plow. Fig. 2 represents a longitudinal vertical section through the mold-board. Fig. 3 represents a detached view of the cutter.

The nature of this invention relates to the manner of combining with the moldboard and colter of a plow an adjustable point, which, as it wears away, may be adjusted, reversed, and elongated, as circumstances may require.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents the beam of the plow. B represents the mold-board, and C the landside. Both the latterare cast in one piece and bolted in the usual manner to the beam A. D is a wedge-shaped piece of steel, used in place of a permanent cutter-point. E is a colter, with a vertical cutting-edge, cast to the bar F, as represented in Fig. 3. The bars F and D fit closely on each other, and pass through acorresponding aperture in the mold-board, so as to form a tight joint, as represented in Fig. 1. Gr represents a cross-bar, which passes from the inner side of the landside to theinner side of the mold-board. The bar F of the cutter E is bolted firmly to said cross-bar. The bar F is provided at its lower side with a series of teeth, I), the points of which teeth do not extend beyond the line of its lower side. The point D is provided at its butt end with projecting edges, one of which abuts against the teeth of the bar F. The bar F and point D are firmly secured together by means of a stirrup, d, through'which passes a screw-bolt, g. The bar F is slightly conical where it passes through the mold-board up to the point a, so as to become firmly wedged into said moldboard by the resistance of the ground against the plow. H represents a cast-steel share or plate, screwed onto the lower front edge of the mold-board, which cuts the furrow-slice horizontally. K are the plow-handles, bolted in the usual manner to the mold-board and landside of the plow.

In using this plow the several parts are arranged as represented in the drawings, the point D entering the ground, point E sepa rating the ground on the landside, and the mold-board B turning the ground over. When the point D has worn off its lower side, the screw-bolt g is loosened. The stirrup (1 then does not hold the bars any longer together. The point D can now be withdrawn to the rear and be turned so as to bring the worn-off side of the edge upward and as the butt end of the point D is provided with one projecting edge on each side, it can be fastened equally well in using it on eitherside. Should the point D in course of time wear off in such a manner as to be shortened, it can easily be advanced the length of one, two, or more teeth, as desired, and in the event of it becoming completely worn out a new point will be welded to the shank.

c is a rung or brace extending from the mold-board to the landside, and which may be cast with or wrought into them. A projecting supporting-piece, f, is arranged on this brace, under which a hook-headed screw-bolt,i, in the rear end of the beam takes, so that the beam, which, when loosened at y, can turn on that point, may be set to change the draft of the plow to or from the land, and then be held in that position by the hook-headed bolt '0'.

Having thus fully described the nature of my invention, what I claim therein as new, and desire to secure by Letters Patent, is

Uniting and adjusting the shank of the point D to and with the shank of the colter E by means of the head on said piece D, the rack on the shank of said colter, and the stirrup and set-screw, substantially in the manner and for the purpose set forth.

JOHN 'ORMISTON. Witnesses:

J OHN KEYHoE, JOHN OHEADLE. 

